Does a CF config with one board with 512 and another with 256 make any improvement over the tradional 256+256? The techs told me that the 512 board could run a little bit slower... does any one know of a bench with this type of setup? TAL

In the case of mismatched memory and turning on CrossFire, the Catalyst driver will force you to reboot. This reboot is to disable 256MB of memory on the 512MB card so that the cards will have matched performance, so having a 512MB vs a 256MB will not get any increase in performance.

But the folks from Sapphire told me that the only thing that could happen was the reduction of speed of the memory on the 512Mb they didn't said the the drivers only recognize 256Mb on each board.... Are they just trying to sell one more card?!?!